Security caution for usage
--------------------------

If you are especially concerned about security, do not create new users
while ordinary users are logged on. Createusers sets users login passwords
by passing parameters on the command line. Many versions of the ps utility 
allow any user to view all the processes and their full command line. 
For example, an ordinary user could run a command like the following 
while users are being created:

  ps -auxww 

This might produce process output like the following, revealing the plain
text password 'pw' for the user 'user22':
 
  bash /usr/sbin/autopasswd user22 pw 

Therefore, if this is a concern to you, either:

 - Do not allow users shell access to the system, or
 - Make sure all users are logged out, and check there are no cron jobs
   set by users using the ps command.
